python 爬取视频

╰半夏微凉° 2022-12-15 11:11 267阅读 0赞

# 一、概述 #

## 爬取步骤 ##

第一步：获取视频所在的网页

第二步：F12中找到视频真正所在的链接

第三步：获取链接并转换成机械语言

第四部：保存

# 二、分析视频链接 #

## 获取视频所在的网页 ##

以酷6网为例，随便点击一个视频播放链接，比如：https://www.ku6.com/video/detail?id=udfY7DjsSXbg8ghbDnhUwNTinOY

![a74d3c859b4bfa71824b769dd70e28b7.png][]

## F12中找到视频真正所在的链接 ##

按F12打开工具栏，network-->Media，这里会显示媒体文件

![577ff33ff7a26a5df854159aab0533cc.png][]

刷新页面，就能看到真正的视频加载链接

![4efa32fe1f686d9f1827d2d46649c665.png][]

## 获取链接并转换成机械语言  ##

查看网页代码，找到js代码。这里面就可以看到真正的视频链接地址

![749956041ad0d544cbcb3289a59c1e9d.png][]

那么通过正则匹配，就可以得到视频地址了。

直接打开这个视频地址，网页可以直接播放。

[https://rbv01.ku6.com/wifi/o\_1ej9q59hk1rpe7hm9os1v9v1btna][https_rbv01.ku6.com_wifi_o_1ej9q59hk1rpe7hm9os1v9v1btna]

## 保存 ##

可以直接播放的话，通过requests模块，就可以下载二进制文件了。

# 三、代码实现 #

完整代码

# ！/usr/bin/python3
    # -*- coding: utf-8 -*-
    import re
    from lxml import etree
    import requests
    import time
    from tqdm import tqdm
    import os
    from urllib.request import urlopen
    
    def download_from_url(url, dst):
        """
        @param: url to download file
        @param: dst place to put the file
        :return: bool
        """
        # 获取文件长度
        try:
            file_size = int(urlopen(url).info().get('Content-Length', -1))
        except Exception as e:
            print(e)
            print("错误，访问url: %s 异常" % url)
            return False
    
        # print("file_size",file_size)
        # 判断本地文件存在时
        if os.path.exists(dst):
            # 获取文件大小
            first_byte = os.path.getsize(dst)
        else:
            # 初始大小为0
            first_byte = 0
    
        # 判断大小一致，表示本地文件存在
        if first_byte >= file_size:
            print("文件已经存在,无需下载")
            return file_size
    
    
        header = {
          "Range": "bytes=%s-%s" % (first_byte, file_size)}
    
        pbar = tqdm(
            total=file_size, initial=first_byte,
            unit='B', unit_scale=True, desc=url.split('/')[-1])
    
        # 访问url进行下载
        req = requests.get(url, headers=header, stream=True)
        try:
            with(open(dst, 'ab')) as f:
                for chunk in req.iter_content(chunk_size=1024):
                    if chunk:
                        f.write(chunk)
                        pbar.update(1024)
        except Exception as e:
            print(e)
            return False
    
        pbar.close()
        return True
    
    def DownloadFile(url, name):
        """
        下载文件
        :param url:
        :param name:
        :return:
        """
        try:
            resp = requests.get(url=url, stream=True)
            content_size = int(resp.headers['Content-Length']) / 1024
            with open(name, "wb") as f:
                print("package total size is:", content_size, 'k,start...')
                for data in tqdm(iterable=resp.iter_content(1024), total=content_size, unit='k', desc=name):
                    f.write(data)
    
            print("%s 下载成功"%url)
            return True
        except Exception as e:
            print(e)
            print("%s 下载失败" % url)
            return False
    
    # 头部
    headers = {
        'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.121 Safari/537.36'
    }
    
    # 访问页面
    response = requests.get('https://www.ku6.com/detail/371', headers=headers)
    data = response.text
    
    #构造了一个XPath解析对象并对HTML文本进行自动修正
    html = etree.HTML(data)
    # 获取视频播放链接
    html_data = html.xpath('//div[@class="r_box"]/ul/li//a/@href')
    # print("html_data", html_data, type(html_data))
    
    # 遍历url
    for i in html_data:
        url = "https://www.ku6.com%s" % i
        print(url)
            
        # 访问url
        response_1 = requests.get(url, headers=headers)
        data_1 = response_1.text
        # 正则匹配视频地址
        video = re.findall('type: "video/mp4", src: "(.*?)"',data_1)
        video_1 = video[0]
        print("video_1", video_1)
        x = video_1.split('/')[-1]
        
        # 本地保存视频文件名
        name = f'{x}.mp4'
        print("name", name)
        
        # 下载视频
        download_from_url(video_1, name)
        
        # 这里只演示第一个视频，直接break
        break

执行代码，效果如下：

![91bd9cb3bfba4c0073f82ce72b67c86e.png][]

本文参考链接：[https://cloud.tencent.com/developer/article/1471132][https_cloud.tencent.com_developer_article_1471132]

[ ][Link 1]

[a74d3c859b4bfa71824b769dd70e28b7.png]: /images/20221123/382a35a77adb47339d944380f5ec1abb.png
[577ff33ff7a26a5df854159aab0533cc.png]: /images/20221123/e0b0432db78b426e998b92c59229f614.png
[4efa32fe1f686d9f1827d2d46649c665.png]: /images/20221123/774f4e8d92f94ebc9ee197c7c797a492.png
[749956041ad0d544cbcb3289a59c1e9d.png]: /images/20221123/249aa7c24af34bfdaf4c083bc4b3b167.png
[https_rbv01.ku6.com_wifi_o_1ej9q59hk1rpe7hm9os1v9v1btna]: https://rbv01.ku6.com/wifi/o_1ej9q59hk1rpe7hm9os1v9v1btna
[91bd9cb3bfba4c0073f82ce72b67c86e.png]: /images/20221123/5865e4135a134280bcdd5f591eba355b.png
[https_cloud.tencent.com_developer_article_1471132]: https://cloud.tencent.com/developer/article/1471132
[Link 1]: https://www.cnblogs.com/phyger/p/11370923.html